TWENTY-THIBD ANNUAL MEETING. 61 



trees; but I have never been so fortunate as to find their nest, neither can I find any 

 authentic description of their nest and eggs. They undoubtedly nest in the tree- 

 tops, like the eastern bird — D. dominica. 



Information in regard to their nesting habits, etc., is very desirable. 



SECOND OCCURRENCE OF THE WHITE-FACED GLOSSY IBIS — PL^GA- 

 DIS GUARAUNA—m KANSAS. 



BY N. S. GOSS, TOPEKA. 



A young female was captured October 17th, 1890, on the Arkansas river, near 

 Wichita, and kindly sent me for identification by Dr. R. Matthews, of that city. 

 The first specimen was shot in the fall of 1879, at a lake near Lawrence — as reported 

 in my Catalogue of the Birds of Kansas — and is now in the fine collection in Snow 

 Hall, at the State University. - 



RADIATION OF HEAT FROM FOLIAGE. 



BY ALFBED GOLDSBOBOUGH MAYEB, LAWEENCE. 



As the greater portion of the land-surface of the globe is covered with foliage, it 

 becomes of extreme importance in determining the radiation of the earth, to know 

 the radiation from foliage. 



In order to determine this, the leaves were fastened to the side of a Leslie cube 

 and exposed at proper intervals, so as to allow them to radiate upon a delicate ther- 

 mopile. 



The radiation of every leaf was compared with that of a similar leaf, lampblacked. 

 The galvanometer used in connection with the thermopile was a Tomson astatic 

 reflecting one. A falling screen was used to expose the thermopile to the radiation 

 from the leaves, and readings of the deflections produced at the end of a half-min- 

 ute and a minute were taken. In every case the thermopile was allowed to cool until 

 the galvanometer came to before taking another reading. In this way it was 

 found that, if we call the radiation from a surface of lampblack 100, the radiation 

 from various leaves was as follows: 



Green poplar leaves 78-80.6 



Yellow poplar leaves 71 



Fresh brown elm leaves 74.5 



Red oak leaves 83.7 



Mullein leaves 74.3 



Green elm leaves 79 



Surface of lampblack 100 



It was found that if leaves were cooled dowh by filling the Leslie cube with 

 cracked ice, the radiation from all kinds of leaves was the same. Thus: lampblacked 

 leaves, brown, green, yellow, or dried leaves, gave exactly the same deflection when 

 cooled down so that a slight film of dew was deposited over their surfaces. 



A side of the Leslie cube was cleaned and polished until it radiated only 14.3 per 

 cent, of a lampblacked side, when both were heated to 212° F. When both were 

 cooled, however, and a copious film of dew caused to form upon them by breathing 

 on their surfaces, it was found that the polished surface radiated 96.8 per'cent. of 

 the lampblacked one. 



By reversing the connections of the thermopile and heating the cube to the boil- 



